Chapter 1 Introducing the GLC1320G-55

Isolation (per-VLAN)

Use isolation to block the subscribers in a specific VLAN from sending traffic directly to each other.

Packet Filter

The GLC1320G-55 supports packet filtering based on protocol. You can configure the GLC1320G-55 to accept all packets, accept PPPoE packets only or block any combination of the following protocols: IP, ARP, DHCP, EAPOL, PPPoE, NetBios or IGMP.

MAC (Media Access Control) Filters

Use the MAC filter to filter incoming frames based on MAC (Media Access Control) address(es) or the OUI (Organizational Unit Identifier) that you specify. You may enable/disable the MAC filter on specific ports. You may specify up to ten MAC addresses per port.

MAC (Media Access Control) Count Limit

You can limit the number of MAC addresses that may be dynamically learned on a port. You may enable/disable the MAC count limit on individual ports.

IGMP Snooping

The GLC1320G-55 supports IGMP snooping enabling group multicast traffic to be only forwarded to ports that are members of that group; thus allowing you to significantly reduce multicast traffic passing through your GLC1320G-55.

IGMP Filter

The IGMP filter defines multicast groups a port can join. You can create IGMP filter profiles which allow access to a multicast group, then assign the IGMP filter to a specific subscriber slot.

Multicast Group Limit

You can limit the number of IGMP multicast groups a subscriber on a port can join. You may enable/ disable the multicast group limit on individual ports.

Discarding of IGMP Query Messages

The GLC1320G-55 discards IGMP query messages received from subscriber ports. This prevents subscribers from hosting IGMP multicast servers.

IGMP Statistics

The GLC1320G-55 records the number of active users in an IGMP multicast channel (multicast group). The GLC1320G-55 also records IGMP message statistics on a per port basis to ease management and troubleshooting.

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GLC1320G-55 User’s Guide